TLDR - TypeScript Programming Language
let age = 25;
In TypeScript, you can explicitly declare the type of the variable:
let age: number = 25;
This ensures that the variable "age" can only hold numeric values, and any attempt to assign a non-numeric value will result in a compilation error.
Classes and Interfaces
Classes in TypeScript provide a way to define blueprints for objects. They encapsulate data and behavior into a single unit, making code more organized and modular. TypeScript classes support features like inheritance, encapsulation, and polymorphism, enabling developers to build complex applications with ease.
Interfaces in TypeScript define contracts for objects, specifying the properties and methods they should have. They enable developers to define the shape of an object and ensure that it adheres to a specific structure. Interfaces also facilitate code reusability and provide a way to achieve duck typing.
Advanced Type System
TypeScript offers an advanced type system that goes beyond basic types like numbers and strings. It includes features like union types, intersection types, type aliases, generics, and more. These features allow developers to express complex types and create reusable abstractions.
Union types allow a variable to hold values of multiple types. For example, a variable can be of type "number" or "string". This flexibility enables developers to write more flexible and expressive code.
Intersection types allow developers to combine multiple types into a single type. This is useful when working with objects that have properties from multiple sources.
Type aliases provide a way to create custom names for types, making code more readable and maintainable. They can also be used to define complex types or combine existing types.
Generics in TypeScript enable the creation of reusable components that can work with a variety of types. They allow developers to write code that is more flexible and adaptable to different scenarios.
Tooling and Developer Experience
TypeScript offers excellent tooling and developer experience. It provides a rich set of features like autocompletion, code navigation, refactoring support, and error checking. TypeScript's static type checking helps catch errors early, reducing the time spent debugging and improving overall productivity.